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JP-7855207-B2 - Vibration isolation mechanism and method for assembling the vibration isolation unit in this vibration isolation mechanism.

JP7855207B2JP 7855207 B2JP7855207 B2JP 7855207B2JP-7855207-B2

Inventors

  • 那須野 洋

Assignees

  • 株式会社タイカ

Dates

Publication Date
20260508
Application Date
20241011
Priority Date
20231013

Claims (8)

  1. A vibration isolation mechanism for mounting a vibration-damping object on a vibrating substrate in a vibrating environment, which reduces or avoids vibrations. This vibration isolation mechanism includes a load-bearing vibration isolation body that supports the weight of the object to be vibration-isolated, It comprises three or more vibration isolation units provided at the connection point between the vibrating base and the vibration-isolating body, The vibration isolation unit is composed of vibration isolation elements, This vibration isolation element consists of a vibration isolation block to which a viscoelastic material is applied, A fixed base is attached to this vibration isolation block in a fixed state and has a connection function with the vibration base, It is configured to include a support bracket that is fixedly attached to the vibration isolation block and has a connection function with the vibration-isolating body, Furthermore, the mounting configuration of the vibration isolation unit is such that at least three vibration isolation units are inclined and arranged so that the axis of the vibration isolation block is focused and directed along the vertical center of gravity line passing through the center of gravity of the vibration-isolating body . Furthermore, the vibration isolation mechanism is characterized in that the vibration isolation element is fixed in such a state that it supports the vibration-isolated body in an initial load-zero state where the load of the vibration-isolated body has almost no effect on the vibration isolation block.
  2. The vibration isolation mechanism according to claim 1 , characterized in that, in the mounting configuration of the vibration isolation unit, the convergence position of the axial centerlines of each vibration isolation block is on a vertical centerline passing through the center of gravity of the vibration-isolated object.
  3. The vibration isolation mechanism according to claim 1 , characterized in that, in the mounting configuration of the vibration isolation unit, the convergence position of the axial cores of each vibration isolation block is the center of gravity of the vibration-isolated object.
  4. The vibration isolation mechanism according to claim 1 , characterized in that the vibration isolation unit has a semi-enclosed casing portion provided on a fixed base or support bracket, and vibration isolation elements are housed within this casing portion.
  5. The vibration isolation blocks in the aforementioned vibration isolation unit are constructed by combining a pair of identical blocks back-to-back, and the combined vibration isolation blocks are fixed to the vibration base via fixed bases at both ends. On the other hand, the vibration isolation mechanism according to claim 1 is characterized in that a protruding support bracket is provided at the intermediate portion of the vibration isolation blocks, which are assembled back-to-back, and the vibration isolation mechanism is fixed to the vibration isolation body via this support bracket.
  6. A vibration isolation mechanism for mounting a vibration-damping object on a vibrating substrate in a vibrating environment, which reduces or avoids vibrations. This vibration isolation mechanism includes a load-bearing vibration isolation body that supports the weight of the object to be vibration-isolated, It comprises three or more vibration isolation units provided at the connection point between the vibrating base and the vibration-isolating body, The aforementioned load-dissipating body supports the vibration-dissipating object from below. Furthermore, the vibration isolation unit includes a semi-enclosure casing portion provided on the vibration base side, This casing comprises a vibration-damping element whose installation position can be adjusted within the casing, The vibration isolation element is configured such that the axial ends of the vibration isolation blocks constituting the vibration isolation element are fixed within the casing, and the vibration-isolating object is supported by a support bracket that protrudes from the axial middle portion. Furthermore, in supporting the vibration-damped body, the load-bearing vibration-damping body supports the weight of the vibration-damped body, so that the vibration-damped body is supported in an initial load-zero state, with almost no load acting on the vibration-damping block of the vibration-damping element.
  7. The vibration-damped body is a three-dimensional laser measurement sensor, Furthermore, the vibration base is a self-propelled work vehicle or a base directly attached to said work vehicle, characterized in that the vibration isolation mechanism according to claim 6 .
  8. A method for assembling a vibration isolation unit in a vibration isolation mechanism for mounting a vibration-damped object on a vibrating base in a vibrating environment, while reducing or avoiding vibrations, The vibration isolation mechanism to which this method is applied comprises a load-bearing vibration isolation body that supports the weight of the vibration-isolated object, and three or more vibration isolation units provided at the connection between the vibration base and the vibration-isolated object, wherein the load-bearing vibration isolation body supports the vibration-isolated object from below. On the other hand, the vibration isolation unit comprises a semi-enclosure casing provided on the vibration base, and a vibration isolation element body provided within the casing so as to be adjustable in its installation position. The vibration isolation element is configured such that the axial ends of the vibration isolation blocks constituting the vibration isolation element are fixed within the casing, and the vibration-isolating object is supported by a support bracket that protrudes from the axial middle portion. Furthermore, in fixing the vibration isolation unit to the vibration-damped body, the load vibration isolation body supports the weight of the vibration-damped body, so that the vibration isolation unit is fixed in an initial load-zero state where the load of the vibration-damped body hardly acts on the vibration isolation block of the vibration isolation element.

Description

The present invention relates to a vibration isolation mechanism and a method for assembling a vibration isolation unit in this mechanism, which is suitable for mounting precision measuring instruments on, for example, civil engineering and construction vehicles in a vibrating environment. With the advancement of autonomous driving and unmanned operations in dangerous construction sites, three-dimensional measurement technologies utilizing optical point cloud sensing technologies such as LiDAR have become commonly used. However, some work vehicles involve intense vibrations, such as those used to break rock, which can potentially damage the measurement equipment. In recent years, there has been a growing need to perform accurate three-dimensional measurements while protecting the equipment from vibrations, even in such working environments. For example, there is a demand for the development of lightweight, compact, and easy-to-assemble mounting brackets (retrofit vibration-damping brackets) that can be retrofitted to existing civil engineering vehicles and effectively dampen vibrations in three axes. By the way, when designing the vibration isolation mount, (1) Lower the natural frequency of the system with respect to the vibration frequency band input from the three axes (vibration isolation), (2) The vibration-damping object (vibration-damped body) prepared by the customer can be mounted as is or with minimal modification. (3) To provide sufficient vibration isolation performance even if the exact mass characteristics of the vibration-isolating body are unknown. Furthermore, depending on the usage environment, (4) It must be compact (especially the height should be kept as low as possible so as not to obstruct optical measurement). (5) The number of parts is small and it is easy to assemble. (6) Take measures to prevent injury by minimizing protrusions and covering bolt tips (points) with rubber caps, etc. (7) Protect the vibration-damping blocks, which are made of materials such as gel, from damage even if they are hit by flying stones or other objects. These factors must also be taken into consideration when designing. In particular, since the mass characteristics of the vibration-isolated object, such as the center of gravity and moment of inertia, are often not known in advance, it is necessary to design a vibration isolation mechanism that does not cause unnecessary pitching or bouncing even if the center of gravity of the vibration-isolated object is higher than expected. Furthermore, the target resonant frequency in each axial direction is 20 Hz or lower, and it is necessary to devise a vibration isolation structure that maintains a certain level of vertical rigidity to support the load while not exhibiting unnecessary rigidity against the excitation force. Japanese Utility Model Publication No. 53-96799Japanese Utility Model Publication No. 55-132493 This diagram (a) illustrates an example of a civil engineering and construction vehicle (excavator) equipped with precision measuring instruments, to which the vibration isolation mechanism of the present invention is applied, and this is a perspective view (b) illustrating an example configuration in which the vibration isolation unit and vibration isolation mechanism are provided at the connection point between the vibrating base and the object to be vibration isolated (object to be vibration isolated).The same as above, a plan view (a) and an enlarged explanatory diagram (b) showing the vibration isolation unit viewed from the side.This is a magnified perspective view showing the vibration isolation mechanism.Diagram (a) schematically shows how the axis lines of at least three vibration isolation units (vibration isolation elements) converge to the center of gravity of the vibration-isolated object, and Diagram (b) shows an example of how the axis lines converge and are directed along the center of gravity.Diagram (a) shows an example configuration in which a box-shaped housing is placed over the vibrating base, and the vibration-isolating body is suspended from the inside of the top of this housing by a suspension spring. Diagram (b) shows an example configuration in which the vibration-isolating body is mounted upside down, so to speak, in a suspended manner, even though the suspension is the same.Diagram (a) shows the configuration of the vibration isolation unit in the basic embodiment, namely, a casing formed on the upper part of the fixed base that is fixed to the vibration base side, with the vibration isolation element body housed inside, and Diagram (b) shows a modified example in which a casing formed on the lower part of the support bracket that is fixed to the vibration-isolated body side, with the vibration isolation element body housed inside.This is an explanatory diagram showing two examples of modifications when the vibration isolation element is composed of a single vibration isolation block. The embodiments for carrying out the p